MySQL 1040: Too many connections.

What is MySQL 1040: Too many connections.

Check the current number of connections:

SHOW STATUS WHERE `variablename` = 'Threadsconnected';

Identify what those connections are doing:

SHOW PROCESSLIST;

If safe, terminate unnecessary or stuck connections:

KILL [connection id];

Temporarily increase the max connections limit (if server resources allow):

SET GLOBAL max_connections = [new limit];